Apparatus for grinding ores and other materials.



H; W. HARDINGE. APPARATUS FOR GRINDING oRE's AND OTHEE'MATERIALS.

APPLICATION FILED 001. 19, 1910. 1,041,783. Patented Oct. 22, 1912.

A j/W I hi4, WQJAqM ATTORNEYS UNITED STATES PATENT OFFICE.

HARRY W. HARDINGE, OF NEW YORK, N. Y., ASSIGNOR T0 HARDING-E CONICALMILL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

, Patented Oct. 22, 1912.

Application filed October 19, 1910. Serial No. 587,850.

To all whom it may concern:

Be it known that I, HARRY \V. HARDINGE,

a citizen of the United States, residing at New York, in the county andState of New York, have invented certain new and useful Improvements inApparatus for Grinding Ores and other Materials, of which the followingis a full, clear, and exact description.

This invention relates to tube mills, ball mills, pebble mills, and thelike, and its chief object is to provide an improved mill which shall becapable of reducing the hardest and most refractory materials to analmost impalpable powder, or when mixed with water, to slime. To thisand other ends the invention consists in the novel features ofconstruction and combinations of elements hereinafter described andclaimed.

Convenient and effective embodiments of the invention are illustrated inthe annexed drawing, in which Figure 1 shows in longitudinal section'aform in which the material is fed in at one end of the mill and isdischarged at the other. Fig. 2 is a longitudinal section showing a millin which the material to be ground is delivered at the center of themill and discharged at each end.

In the form shown in Fig. 1 the barrel or drum, designated by 1, ispreferably cylindrical, and is provided with hollow trunnions 2, 3,rotatably mounted in suitable supports 4, 5, suitable means beingprovided for rotating the barrel, as for example a gear 6 adapted tomesh with a power driven gear or pinion not shown. Inside of the barrelor drum, adjacent to the inlet trunnion 2, is a hollow cone 7 arrangedwith its apex directed toward the outlet trunnion and having at suchapex an outlet or discharge opening 8. This hollow cone constitutes ineffect a partition, dividing the drum into two compartments or chambers,9, 10, and by reason of the conical shape of the partition it performsthe function of sizing the pieces or lumps of material, permitting onlythe smaller pieces to escape into the second chamber, as will be morefully described hereinafter. The mill may be used for either wet or drygrinding, in the former case a stream of water being kept flowingthrough the drum from the inlet to the outlet. Also, suitable grindingor crushing bodies may be used to aid in reducing the material, or, ifdesired, such bodies may be omitted, leaving by the impact and attritionof its own pieces or lumps upon eachother.

In the operation of the mill shown in Fig. 1 the material is introducedthrough the inlet trunnion 2 by means of a suitable supply pipe 2 intothe chamber 9 which is separated from chamber 10 by the conical outletport-ion 7. In this conical chamber the material assorts itselfaccording to size, the pieces or lumps being largest where the chamberhas the greatest diameter and grading in size toward the outlet 8, wherethe smallest pieces find their way out into the second chamber, afterthe manner described more in detail in my prior Patent No. 908,861,-issued January 5, 1909. In the second chamber the small particles orpieces delivered by the conical chamber are again subjected to impactand attrition among themselves as Well as among the balls, pebbles, orother crushing or grinding bodies when such are used,. with the resultthat by the time the outlet 3 is reached the material is reduced to thedesired fineness.

In Fig. 2 the mill is in effect double, two conical partitions, 7 7being provided at the center of the barrel or drum 1 In this case thematerial is introduced through a feed pipe 11 projecting through eithertrunnion 12, 13, and is discharged at a point between the two conicalportions. The material then assorts itself, grading in size toward bothoutlet openings 14, 15. There are thus, in effect, two conical chambers,and two outer chambers in which the final grinding or reducing isperformed, the material issuing from both trunnions 12, 13.

The mill described is particularly advantageous for grinding hard orrefractory ores, but it can be used with markedly good results forreducing other materials, as for example materials for making cement, aswell as ores of a less refractory nature.

I prefer to construct the apparatus as herein specifically illustrated,but it is to be understood that the invention is capable 'of embodimentin other forms without departure from its proper spirit and scope asdefined by the appended claims.

I claim:

1. In a mill for the purpose described, in combination, a drum havinghollow trunnions at its ends, conical partitions mounted inside the drumproviding conical chambers the material to be ground or reduced solely.

therein and having discharge openings at their apexes, a feed pipe forsupplymg material to be ground and extending through one of the apexesof the conical partitions,

and. means for rotating thedrum and coniing, a conical partitionarranged with its apex toward said outlet opening of the drum the basethereof connected to said drum and dividing the same into twocompartments, the exterior of said conical portion constituting the endwall of one compartment.

4. In a mill for the purpose vdescribed, in combination, a drum havingan outlet openbase of the conical rectly to the drum said conicalportion con- 31 ing and an inlet, a conical partition having 2,

an opening in said apex, arranged with said apex toward the outletopening and dividing the drum into two. compartments, with the ortionconnected di;

stituting the ments.

5. In a mill for the purpose described, in combination, a drum havlnghollow trunend walls of the two compartnions at its ends, a conicalpartition mount- 31 ed inside the drum and dividin the latter intotwocompartments, means or directly discharging material to be treatedinto one of the compartments, and means for allowing the treatedmaterial to issue from both ends of the drum.

In testimony whereof I afiix my signature in the presence of twosubscribing witnesses.

HARRY w. HARDINGE. Witnesses 2 i M. Lawson DYER, S. S. DUNHAM.

